<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react资料_stu//依赖包/react.development.js"></script>
    <script src="../react资料_stu//依赖包/react-dom.development.js"></script>
    <script src="../react资料_stu//依赖包/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        class App extends React.Component{
            state={
                count:0
            }

            render(){
                console.log('----render----');
                const {count}=this.state;
                return(
                    <div>
                        <button onClick={this.handle}>+</button>
                        <p>{count}</p>
                        </div>
                )
            }
            // 事件函数
            handle=()=>{
                // 直接修改state不会重新调用render 不会重新渲染
                this.state.count ++;
            }
        }
        ReactDOM.createRoot(document.getElementById('app')).render(<App/>)
    </script>
</body>
</html>